They can be, depending on the climate of that part of your country. From a little research, it would appear that your climate is quite mild, and would be fine for the tree.

I would recommend, as I do for all young trees, to keep the tree in an area that will not freeze, only when the threat of freezing temperatures arise. You will only have to do this for the first year, and then the tree will be hardy enough to fend off nature just fine on its own.